MSDS Cabosil, M5 Grade. Eager Plastics ChicagoEager Plastics, Inc.
3350 W. 48th Place
Chicago, IL 60632-3000
Phone: 773-927-3484   FAX: 773-650-5853
www.eagerplastics.com
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Material Safety Data Sheet
CAB-O-SIL, M-5 grade
Eager Plastics # EP7965
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HMIS Index
0  Minimal
1  Slight
2  Moderate
3  Serious
4  Severe
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HMIS Rating
1-Health
0-Flammability
0-Reactivity
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MSDS has been prepared in accordance with ANSI Standard Z400-1998, EC directive 
91/155/EEC, 93/112/EEC.
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Section I  Chemical Product and Company Identification
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Trade Name: CAB-O-SIL, (registered trade name) untreated fumed silica.
Manufacturer: Cabot Corp. CAB-O-SIL Division, 700 E. U.S. Highway 36, Tuscola, 
IL 61953-9643
                        Telephone No., 1-217-253-3370
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Section II  Composition / Information on Ingredients
Substance, Trivial Name: CAB-O-SIL, (registered trade name) amorphous fumed 
silica.
Formal Name: Synthetic Amorphous Silicon Dioxide, Crystalline- free
Chemical Name: Oxide
Chemical Formula: SiO2
Molecular Weight: 60
CAS No., 112945-52-5 (Specific), 7631-86-9 (General)
% by weight 99+
Trade Names and Synonyms: fumed silica, M-5, Colloidal silica, Synthetic silica, 

Material Uses: Used as a rheology control, reinforcement and free flow agent in 
Silicone Rubber, Coatings, Adhesives, and Pharmaceuticals etc. 
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Section III  Hazards Identification
Main Hazards: Dry powdered materials can build static electrical charges when 
subjected to friction.  Proper precautions when using CAB-O-SIL (registered 
trade name) fumed silica in the presence of flammable or explosive gasses and 
liquids should be taken to prevent accidents. 
Potential Health effects:       Eye: May cause irritation at high dust levels
                                          Skin: May cause drying of skin
                                          Ingestion: None expected
                                          Inhalation: Temporary discomfort due 
to inhalation of dust
Chronic: Not listed as carcinogen by IARC, NTP, Z list or OSHA
Teratology: None identified
Reproductive Info: None identified
Target Organs: Lung
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Section IV  First Aid Measures
Inhalation: Not hazardous.  In case of discomfort, remove exposed individual to 
fresh air
Ingestion: Not hazardous.  No treatment required
Eyes: Immediately flush lightly with plenty of water for 15 minutes. Get medical 
attention
Skin: Not hazardous
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Section V  Fire fighting Measures
Extinguishing Media: Not applicable
Unsuitable Media: Not applicable
Flash Point: Not applicable
Flash Point Method: Not applicable
Lower Explosive Limit: Not applicable
Upper Explosive Limit: Not applicable
Ignition in Air: Not defined 
Flammable Classification: Not applicable
Flame Propagation in Air: Not applicable
Fire Fighting Procedure: Not applicable 
Combustion Hazards: Not applicable
Protective Equipment: Standard personal protective equipment for structural fire 
fighting
Unusual Fire Hazards: See Section III 
Dust Explosion Potential: Will not create or support conditions that would 
result in a dust explosion
Sensitivity to Impact: Not applicable 
Static Discharge Effects: Static electricity can build up when subjected to 
friction. See Section III
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Section VI - Accidental Release Measures
Personal Precautions: Wear goggles if release creates conditions where eye 
contact is probable.  If airborne dust concentrations exceed the applicable 
exposure limits, then an approved respirator for dust/mist is recommended.
Spill Cleanup Measures: Spills may be collected, preferably by vacuum, and 
placed in suitable container for disposal.
Environmental Precautions: Fumed silica is a not hazardous waste.  Dispose of in 
landfill in accordance with international, national, U.S. federal and local laws 
and regulations.
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Section VII  Handling and Storage
Handling Precautions: Ventilated work area if necessary. Take precautionary 
measures against possible build-up of electrostatic charge. Assess manual 
handling of bagged product; take suitable precautions.
Storage: Product should be stored dry and away from volatile chemicals.
Hygienic Practices: Avoid eye contact. Wash exposed skin and clothing 
frequently.
Special Precautions: Avoid creating dust.  Clean up spills promptly. 
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Section VIII  Exposure controls / Personal Protection 
Inhalation Standards:  TLV (U.S.) = 10 mg/cubic meter total dust particles not 
otherwise classified
                                    PEL (U. S.) = 10 mg/cubic meter for nuisance 
dust
                                    MAK (Germany) = 4mg/cubic meter total dust
OES (U.K.) = 6 mg/cubic meter total inhalable, 2.4 mg/cubic meter respirable 
Eye-Face Protection: Safety glasses with side shields or goggles recommended to 
prevent eye contact.
Skin Protection: Drying may occur. Use barrier cream prior to skin contact.
 
Section VIII  Exposure controls / Personal Protection, continued
Protective Clothing: None required
Respiratory Protection: Approved dust/mist respirator recommended for illegal 
concentrations
Engineering Controls: Use general or local exhaust ventilation to meet exposure 
limit requirements
Other Protective Measures: Wash exposed skin and clothing frequently
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Section IX  Physical and Chemical Properties 
Physical State: Solid powder
Color: White
Odor: None
Odor Threshold: Not applicable
ph: 4.0 (approximately 4% silica in water)
Boiling Point: 2230 degree Celsius
Evaporation Rate: Not applicable
Melting/Freezing Point: 1700 degree Celsius or 3092 degree Fahrenheit
% Volatile by Volume: Not applicable
Solubility in Water: Insoluble in water
Density:  2.2 g/cubic centimeter @ 25 degree Celsius
Vapor Pressure: Not applicable
Water/ Oil Distribution: Not applicable
Viscosity: Not applicable
Pour Point: Not applicable
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Section X  Stability and reactivity
Chemical Stability: Stable
Conditions to Avoid: None
Incompatible Materials: Not applicable
Reactivity: Stable
Hazardous Decomposition: None
Hazardous Polymerization: None
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Section XI  Toxicological Information
Routes of exposure: Ingestion, Inhalation, Eye and Skin
Acute Inhalation Effect: None known other than possible temporary discomfort
Acute Ingestion Effect: None expected
Acute Eye Effect: Irritation at high dust levels
Acute Skin Effect: May cause drying of skin
Chronic Inhalation Effect: There is no human data available that suggests that 
occupational exposures to synthetic fumed silica will cause adverse chronic 
health effects.  Long-term inhalation animal studies involving a variety of 
insoluble solid particles have resulted in chronic inflammation, lung fibrosis 
and lung tumors in rats.  Tumors were not observed in similar studies using 
other animal species (i.e., mouse and hamster).  Most inhalation toxicologists 
feel the tumor response is unique to rats and not relevant to human exposure.  
Synthetic fumed silica was not used in these tests.  The researchers who 
conducted the above studies felt the adverse reactions in the rat were due to 
high exposure levels of insoluble dusts overwhelming the lung clearance 
mechanisms (lung overload phenomenon) and is not the result of specific chemical 
effect of the particulate tested.  This effect is not expected to occur from 
occupational exposure to synthetic amorphous silica.
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Section XI  Toxicological Information, continued
Chronic Ingestion effect: None expected
Chronic eye effect: None expected
Chronic skin effect: None expected
Sensitization to Material: None expected
Medical Conditions Aggravated: Dermatitis
Synergistic Materials: None expected
Mutagenicity: In-vitro and in-vivo tests negative for mutagenicity
Reproductive Toxicity: None known
Teratogenicity: None known
Carcinogenicity: Not listed as a carcinogen By IARC, NTP, Z list or OSHA
LD50 for Material:     Greater than   5,000 mg/kg, acute oral rat
                                 Greater than   5,000 mg/kg, acute dermal for 
rabbits
                                 Greater than   5,000 mg/kg, rat   No OECD 
method
                                 Oral-rat 3,160 mg/kg (SAX)
LC50 for Material:   Not applicable
                                 Greater than 0.139 mg/ quarter hour, Rat acute 
inhalation
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Section XII  Ecological Information
Mobility: Not soluble in water, not mobile in soil
Persistence / Degradability: Not applicable
Bio-accumulation: Not applicable
Ecotoxicity:       Acute fish Toxicity: NOEC (96 hr) greater than or equal to 
10,000 mg/l, Brachydanio
                        rerio, OECD 203
                        Acute Daphnia Toxicity: NOEC (24 hr) greater than or 
equal to 1000 mg/l, Daphnia 
                        Magna, OECD 203
                        WGK Water Hazard Class: 0
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Section XIII  Disposal Considerations
Legal Classification: Not hazardous waste under U.S. RCRA (Resource Conservation 
and Recovery Act) Regulations.  Not a restricted/non-hazardous waste under 
Canadian Workplace Hazardous Materials Information Systems (WHMIS) regulations.  
Fumed silica is not a special waste under U.K. Special Waste Regulations 1996.  
Dispose of in accordance with local regulations.  These regulations implement EC 
directive 91/689 and decision 94/904.
Waste key Number:   314 42 Silicic acid and silica waste TA waste (Germany)
                                 314 42 Silicic acid and silica waste ONORM 
(Austria)
Container Disposal: May dispose of with domestic waste in accordance with the 
necessary technical regulations following consultation with waste experts and 
the responsible authorities
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Section XIV  Transportation Information
UN Number: Not classified
UN Proper Shipping Name: Fumed silica, Crystalline-free
UN Class: Not classified
UN Packing Group: Not classified
U.S. Rail Regulations: Not classified
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Section XV  Regulatory Information
National Registries: CAB-OSIL (registered trade name) 
Australia: AICS Australian Inventory list, CAS # 7631-86-9
Section XV  Regulatory Information, continued
Canada: CEPA, Canadian Environmental Protection Act, 6th Amendment Domestic 
Substances List, CAS #7631-86-9.
Europe: EINECS, European Inventory of Existing Commercial Chemicals Substances, 
#2315454.
Japan: MITI, Ministry of International Trade and Industry List of Existing 
Chemical Substances. 
#1-548(1-810)
United Kingdom: Control of Substances Hazardous to Health Regulations 1994  
listed in Guidance Note EH40.  Chemicals (Hazardous Information and Packaging 
for Supply) Regulation 1994-Not listed
United States: TSCA, Toxic Substance Control Act, CAS #7631-86-9
U.S. Clean Air Act, 1990: (CAA Section 112, 40 CFR82):  CAB-O-SIL (registered 
trade name) fumed Silica does not contain and is not manufactured with Class I 
or Class II ozone depleting chemicals, as defined in the Clean Air Act of 1990.
Comprehensive Environmental Response, Compensation & Liability Act, (CERCLA, 40 
CFR302):  Not hazardous.
Superfund Amendments & Reauthorization Act (SARA) Title III.
    Emergency Planning & Community Right-To-Know ACT (EPCRA, 40 CFR355): 
Non-Hazardous
    SARA Section 311 (40 CFR 370): MSDS Requirements: not regulated
    SARA Section 312 (40 CFR 370): Applies in quantities greater than or equal 
to 10,000 lbs.
    SARA Section 313 (40 CFR 372):  Does not contain any of the substance 
identified under Section
    313 as toxic.
U.S. CONEG Legislation: Not determined.              
U. S. FDA Regulations: The use of CAB-O-SIL (registered trade name) has been 
approved by the United States Food and Drug Administration (FDA) for many food 
applications as both direct food additive at levels up to 2 % by weight and as a 
substance allowed in the manufacture of materials that come in direct contact 
with food in various producing, manufacturing, packing, preparing, transporting 
and holding operations. Pertinent sections can be found in Title 21 Code of 
Federal Regulations, Part 172 Food Additives Permitted for Direct Addition to 
Food for Human Consumption. 
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Section XVI  Other Information 
Pharmaceutical Information: CAB-O-SIL meets all of the requirements for 
colloidal silicon dioxide as describe in the U.S. Pharmacopoeia National 
Formulary.  It also meets the requirements as described in the European 
Pharmacopoeia and the Deutsches Arzneibuch (DAB 1996) and the Japanese 
Pharmacopoeia.  It appears in the Handbook of Pharmaceutical Excipients under 
the monograph, colloidal silicon dioxide.
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Last Revision: January 22, 2007.  
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Disclaimer: The information set forth is based on information that is believed 
to be accurate.  No warranty, expressed or implied, is intended.  The 
information is provided solely for your information and consideration and 
assumes no legal responsibility for use or reliance thereon.